Server Administration & Management

The Linux Virtual Server Project (LVS) allows load balancing of networked services such as web and mail servers using Layer 4 Switching. It is extremely fast and allows such services to be scaled to service 10s or 100s of thousands of simultaneous connections. Now configure ipvsadm in both node

——————————————————————————————————————————-logfacility local0 –> Facility to use for syslog()/logger
——————————————————————————————————————————-keepalive 2 –> how long between heartbeats

A note on specifying “how long” times below, The default time unit is seconds 10 means ten seconds You can also specify them in milliseconds 1500ms means 1.5 seconds
——————————————————————————————————————————-deadtime 30 –> how long-to-declare-host-dead?

If you set this too low you will get the problematic split-brain (or cluster partition) problem.
——————————————————————————————————————————-warntime 10 –> how long before issuing “late heartbeat” warning?
——————————————————————————————————————————-initdead 120 –> Very first dead time (initdead)

On some machines/OSes, etc. the network takes a while to come up and start working right after you’ve been rebooted. As a result we have a separate dead time for when things first come up. It should be at least twice the normal dead time.
——————————————————————————————————————————-udpport 694 –> What UDP port to use for bcast/ucast communication?
——————————————————————————————————————————-bcast etho –> What interfaces to broadcast heartbeats over?
——————————————————————————————————————————-auto_failback on
on –> enable automatic failbacks
off –> disable automatic failbacks
legacy –> enable automatic failbacks in systems where all nodes do not yet support the auto_failback option.
——————————————————————————————————————————-node –> Tell what machines are in the cluster
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